Quick Answer
To navigate through dense forests, contour matching involves identifying distinctive landscape features such as ridges, valleys, and streams, and matching them to a topographic map. This technique utilizes an altimeter to gauge elevation changes, providing a precise reference point for navigation. By combining map interpretation with altimeter readings, one can effectively traverse dense forests.
Understanding Contour Lines
Contour lines are essential for contour matching. On a topographic map, contour lines represent the boundaries between different elevation levels. Look for the interval between contour lines, which typically ranges from 10 to 50 feet. In dense forests, contour lines may be more spaced out or irregular due to the terrain. When using an altimeter, set the reference elevation to match the starting point’s contour line on the map.
Altimeter Calibration and Readings
Calibrate your altimeter before use to ensure accurate readings. This involves adjusting the device to match the known elevation of a reference point. When taking readings, move in small increments, typically 10-20 meters, and record the altimeter’s elevation change. Compare these readings to the map to identify corresponding contour lines and verify your position.
Combining Map and Altimeter Data
To effectively contour match, combine map interpretation with altimeter readings. Start by identifying distinctive landscape features on the map, such as a stream or ridge, and locate the corresponding contour lines. Use the altimeter to gauge elevation changes and verify your position by matching the readings to the map. This process requires a combination of map reading skills, altitude awareness, and patience. Practice contour matching in open areas before attempting it in dense forests.
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